Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
TRACTOR-TRUCK
The hinged trailer was manufactured and installed on the tractor MTZ-5 (Fig. 1). Figure 2 shows a diagram of the tipper Assembly. Its main parts: a support frame body, weld metal landing...
THE CONDUCTOR-TELESCOPE
Of tubes of different diameter, tightly placed one on another, you can build a jig for drilling end holes in cylindrical rods of various cross sections. For the outer bushings are better...
